单项选择题

You can hardly imagine the difficulty the woman had ______ her children.

A．brought up
B．to bring up
C．bringing up
D．to have brought up
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单项选择题
______ in 1943 ______ the harmful smog made its appearance in Los Angeles.
A．Only ... that
B．it was ... then
C．That it was ... when
D．It was ... that
单项选择题
Such ______ the results of the experiments.
A．is
B．was
C．are
D．as be
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